I don't know which models you were looking at or where at on them because they all have them. This was lifted right from Deere's site, and is for their smallest CUT, the new 2025R-
"Sturdy ratchet-type park brake (A) is included for positive parking position
Individual wheel brake pedals.
Competitive advantage - competitive hydrostatic tractors locate brake pedals on same side as their foot control (treadle pedal, right-hand side)
This makes the turning brakes useless for maneuvering
The 2025R and 2032R brake pedals are located on the left-hand side so the operator's right foot is free to operate the HST foot pedals
Especially useful for making tight turns or when maneuvering the tractor with a loader or snow blower"